JOK3R1994

i have a 92 civic 5 speed 1.5 D series i belive i have to do a valve job on it and i figured if im have to replace them then this was the time to start building my race motor so im wonder what valves do you guys think i should put into it for best performance. thanks in advance

CandyRedRC46

You're going to build a race motor out of a d15b7?

JOK3R1994

i mean if im going to be doing work to it i want to do perfamnce parts on it and get more HP yea

CandyRedRC46

Most people are going to tell you to junk the entire engine/trans and b swap it. I am just going to tell you to junk the head and do a mini me.

egsleepercivic

As stated above, I think you would be better off with an ls swap dollar for dollar

JOK3R1994

like put a vtec head on it?bc i have one from my last b series 1.6 is that what you mean by a mini me?

JOK3R1994

.

mk378

A B head will not fit on a D block. Though it is possible to race anything, nobody seriously considers going racing with a non-VTEC engine.

JOK3R1994

i already have a B head on a D block so can i just go vtec head

TomCat39

Instead of spending lots of cash on new "upgraded" valves and everything that goes with it (new seats, valve guides, seals and oversized valves, and full port and polish).

I would just have a standard valve train rebuild done on it with stock valves, maybe upgrade your springs, retainers and keepers.

And then put a D16A2 camshaft (I think from the 1988 in particular) into your D15B7 head.

This has proven to be a very solid performance boost to the non vtec D15B7. If you do a google search for D15Beast7 you should come across a very helpful bit of information.

You will save a fair amount of money and maximize the performance of the nearly already maxed out motor in your car.

JOK3R1994

this is what i found today when i took the head off

JOK3R1994

thank you finally some good advice if i have the means to should u put a 1.6 vtec in it?

also i pulled the codes one day and it was throwing vtec codes could that be because the ecu is for a vtec?

mk378

The piston and cylinder are likely trashed from that valve head bouncing around. So it's looking more like replace the whole engine.

Yes of course you get VTEC codes when connected to a non-VTEC engine. You can move a jumper inside the P28 ECU to make it run as a P06 and not throw VTEC codes if you really want a non-VTEC engine.

TomCat39

Also looking at the picture of the head and valves, it looks like it already has had a real mix mash of valves stuck in it.

Couple that with vtec ecu on a non vtec motor.... This really looks like a full on hack job of the worst kind.

I too would border on the base motor is not worth working with and look at a different motor to put into the car.

JOK3R1994

if i have to replace i obviously want a vtec in it and i bought the car put about 1200 miles on it this is the first thi g i have done to it so i had no idea what has been done to it

JOK3R1994

how bad would the piston have to be and how can you tell the valves are mixed around

TomCat39

The very first picture shows all the valves on the head, some look flat, some look like the OEM curved divot and others look like a machined divot.

To boot, this mix mash is on both intake and exhaust from the appearance in the picture.




Red circles, some are flat, some are divot.
Blue circles, some appear to be flat (could be picture) and some are smooth curve divot and the one is machine cone like divot.
Black circles, the left side looks like a bigger seat than the right two.

This head has had a number done on it in my opinion.

As for piston damage, see the first post in this thread to see a picture of what a valve bouncing around in the cylinder does to a piston:
https://honda-tech.com/forums/honda-...ngine-3311746/

JOK3R1994

ok i see wht you are saying all of cylinder one is bent and that on that snapped so that might be the size difference you are seeing im not sure and the ones that look flat thats just an lot of build up its like brown and crystallized and here is my piston damage :/

JOK3R1994

JOK3R1994

JOK3R1994

so what do you think tomcat39 time for a new motor?

TomCat39

I would if it were mine. I believe many others here would too. Easier to build up another platform than to correct that one and build it up.

Also as an FYI for you, the D15B7 isn't a well supported motor as there isn't much potential in it for more power over stock. Support tends to be on engines (any brand) that end up having a decent amount of power that can be unlocked.

If you do some research you will likely find that even throwing a lot of money at the D15B7, the gains aren't that great.

Simply put, the D15B7 is a great little cheaply modded motor to learn on and have some fun, but that's about it really. And by cheap, I mean with other honda parts making a minime or the beast7. But spending significant dollars on aftermarket internals just doesn't give you enough bang for the buck.

JOK3R1994

thats for the advice looks like im gonna be pulling a motor this weekend

CandyRedRC46

LOL no you do not.

KYS bro

JOK3R1994

what?